g2

Geometry OTQGeometry OTQ

Are you ready for this chapter?

pg. 235

1 – 3, 5, and 6

g2

Homework Questions?Homework Questions?

g2

What will I be able to do?What will I be able to do?Identify and classify triangles by angles and sides

What standard will I learn?What standard will I learn?12.0 Students find/use measures of sides/angles

of triangles

g2

4.1 Triangles and Angles

g2

Classifying Δs (angles vs sides)

Equiangular(all s)

Acute(3 acute s)

Right(1 right )

Obtuse(1 obtuse )

Equilateral(3 sides)

Isosceles(2 sides)

Scalene(0 sides)

80 60

40

120

g2

What kind of triangle does the cable-suspension of this bridge have?

RIGHT TRIANGLE!!!!

g2

Example 1:Example 1:

Classify each triangle by its angles and sides.1. MNQ

2. NQP

3. MNP

acute; equilateral

obtuse; scalene

acute; scalene

g2

Example 2:Example 2:

Classify the triangle by the description given:

A) Side lengths: 3 in, 5 in, 3 in

B) Side lengths: 3 ft, 5 ft, 4 ft

C) Angle measures: 60°, 90°, 30°

D) Angles measures: 10°, 160°, 10°

Isosceles

Scalene

right

obtuse

g2

Pencils Down!

1) A scalene is ________ an equilateral .

2) A right ________ has an angle of 90°.

3) An isosceles triangle is __________ an

equilateral .

Complete the sentence with always, sometimes, or never.

never

always

sometimes

g2

SUMMARYSUMMARY

g2

CLASSWORK Pages 241 – 242 #’s 22 – 36 even,

40 – 46 even

Homework is on the next slide

g2

HOMEWORK Page 244 #’s 74 – 80 even

Do your homework….or Pyramid Head will be sent to your house!!!